In this paper, the optical second harmonic generation (SHG) of cherenkov scheme in channel waveguide was analized and the condition of waveguide for Cherenkov type SHG was discussed in detail. We obtained the SHG power at wavelength of 0.53 μm by coupling 1. 06 μm fundamental power into the guide. The conversion efficiency is about 0.9% corresponding to the 10 mW input power.